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Definition of dufrenoysite in US English:

dufrenoysite

noun

Mineralogy

A mineral consisting of a sulphide of lead and arsenic, typically occurring as dark grey prisms with a metallic lustre.

Origin

Mid 19th century; earliest use found in Chemist. From French dufrénoysite from the name of Ours-Pierre-Armand Petit-Dufrénoy, known as Pierre-Armand Dufrénoy, French geologist and mineralogist + French -ite, with insertion of s for euphony, probably after other mineral names ending in -site.